Nate Ramo was a SWAT officer within the Gotham City Police Department, as well as a murder victim.
Nate Ramo, alongside most of his SWAT unit, underwent an investigation of corruption by Internal Affairs. Ramo decided to reveal everything that he knew about his teammates corruption, secretly. Unfortunately, one of Ramo's teammates, John DeMarco, learned of his attempted plea bargain, and proceeded to murder him via a hit and run just outside the GCPD Building. Batman learned of the hit and run from a police dispatch via Officer Meyer, arrived at Burnley, investigated the event, and deduced DeMarco's involvement from paint residue from DeMarco's car (as he had briefly crashed into a wall due to losing control of the vehicle while he killed him). Batman then tracked DeMarco down to a nearby building alongside the other SWAT members (the dialogue suggested that they were aghast at DeMarco for killing Ramo in front of the GCPD, as they realized that it would have likely made them seem even more guilty than before), and, after he interrogated DeMarco, left him to be arrested by the GCPD.